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Ok, i see! I think i will buy one of those RF-BLD then and try it out

actually, the Rockford amps, such as the 1000 do about 1400w on paper (and the AD-1) but by the time rise starts happening (to a speaker in a real box) it is only about half of that with a bad electrical system and right about exactly 1000w on a proper electrical system..and over that on a MORE than proper one (a little bump in input voltage). So being under rated isn't just a bonus thing to brag about. Being under rated like an RF amp usually is allows for that rise and in the end, if you have done everything close to correctly on your side, you still get your rated power. USUALLY. Proof is in my own video's above.

RF HLC and HLC-4 will likely give you the same problems. The RF BLD should work well for you though. Here is the problem, the inexpensive LOCs use a transformer to take the high level signal and reduce it down to low level. Transformers work by creating a magnetic field and transmitting the signal that way. Like wireless communication. As you may be aware wireless transmission works best at high frequencies, at lower frequencies it basically stops working. That is what is wrong with all the inexpensive LOCs out there, they use transformers. It works fine at 1kHz, but below 50Hz the wheels start to fall off. At 40Hz they are so distorted the DD-1 will report distortion at any level. By 20Hz there is nothing that resembles a sine wave coming out of those things. The transformer coupled LOC is a great example of a product designed by a marketing person. No electrical engineer would ever recommend that.